Question 1

The lanthanide contraction is due to the poor shielding effect of the f-electrons and the higher nuclear charge.

Accepted Answer

A) True 
 B)False

Question 2

The phenomenon resulting from the weakly effective screening of outermost electrons from the nucleus by f subshell electrons, resulting in only small differences in atomic radii in elements of atomic number 58-71, is called the:

Accepted Answer

A)  actinide expansion 
B)  f-subshell extension 
C)  lanthanide contraction 
D)  elemental transition 
E)  lattice distortion 
A)  actinide expansion 
B)  f-subshell extension 
C)  lanthanide contraction 
D)  elemental transition 
E)  lattice distortion

Question 3

A 25.0 mL aliquot of a solution containing Fe2+, prepared during an assay of a pyrite ore, was titrated to a faint purple endpoint by 32.2 mL of 0.020 M KMnO4. What was the molarity of the Fe2+ solution? [The permanganate was reduced to Mn2+.]

Accepted Answer

A)  0.13 M 
B)  0.19 M 
C)  0.26 M 
D)  0.31 M 
E)  0.47 M 
A)  0.13 M 
B)  0.19 M 
C)  0.26 M 
D)  0.31 M 
E)  0.47 M

Question 4

The coinage metals are copper, silver, and zinc.

Accepted Answer

A) True 
 B)False

Question 5

What are the formulas of the missing compounds, 1 and 2, respectively, in the reaction below? This reaction is used in the production of metallic zinc. ZnO(s) + 1 → Zn(g) + 2

Accepted Answer

A)  C(s) and CO(g) 
B)  CO(g) and ZnCO3(s) 
C)  CO(g) and C(s) 
D)  C(s) and CO2(g) 
A)  C(s) and CO(g) 
B)  CO(g) and ZnCO3(s) 
C)  CO(g) and C(s) 
D)  C(s) and CO2(g)

Question 6

If a solution is prepared by dissolving 1.6 mol Na2CrO4 in 1.0 L of a buffer at pH 8.24, what will be [Cr2O72-] in the solution? The resultant equilibria are: HCrO4- ⇌ H+ + CrO42-  &emsp; Ka = 3.2 × 10-7
2 HCrO4- ⇌ Cr2O72-+ H2O   &emsp;  K = 33

Accepted Answer

A)  9.9 × 10-5 M 
B)  2.9 × 10-28 M 
C)  8.9 × 10-9 M 
D)  8.6 × 102 M 
E)  2.8 × 10-2 M 
A)  9.9 × 10-5 M 
B)  2.9 × 10-28 M 
C)  8.9 × 10-9 M 
D)  8.6 × 102 M 
E)  2.8 × 10-2 M

Question 7

The atomic radius of Ru is approximately the same as that of Os.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following forms a colorless aqueous solution?

Accepted Answer

A)  CuClO4 
B)  CoSO4 
C)  NiCl2 
D)  FeCl3 
A)  CuClO4 
B)  CoSO4 
C)  NiCl2 
D)  FeCl3

Question 9

What volume of carbon monoxide, measured at 1200°C and 720 torr, would be released when 5.0 kg of an ore containing 45% zinc oxide as the only reacting species is treated with excess carbon? [ZnO + C → Zn + CO]

Accepted Answer

A)  1.2 × 102 L 
B)  1.5 × 103 L 
C)  3.5 × 103 L 
D)  7.8 × 103 L 
E)  7.0 × 1 04 L 
A)  1.2 × 102 L 
B)  1.5 × 103 L 
C)  3.5 × 103 L 
D)  7.8 × 103 L 
E)  7.0 × 1 04 L

Question 10

List the following in order of increasing density: Ti, Pd, Nb, Pt

Accepted Answer

A)  Ti < Pt < Pd < Nb 
B)  Nb < Ti < Pt < Pd 
C)  Pd < Nb < Ti < Pt 
D)  Pt < Pd < Nb < Ti 
E)  Ti < Nb < Pd < Pt 
A)  Ti < Pt < Pd < Nb 
B)  Nb < Ti < Pt < Pd 
C)  Pd < Nb < Ti < Pt 
D)  Pt < Pd < Nb < Ti 
E)  Ti < Nb < Pd < Pt

Question 11

Choose the INCORRECT statement.

Accepted Answer

A)  Aqua regia is a combination of HCl and HNO3. 
B)  Malleable means that a metal can be beaten into a thin sheet. 
C)  One of the most important property of Cu, Ag, and Au is resistance to corrosion. 
D)  Because the ions of Cu, Ag, and Au are easy to reduce means that the metals are easy to oxidize. 
E)  The coinage metals are Cu, Ag, and Au. 
A)  Aqua regia is a combination of HCl and HNO3. 
B)  Malleable means that a metal can be beaten into a thin sheet. 
C)  One of the most important property of Cu, Ag, and Au is resistance to corrosion. 
D)  Because the ions of Cu, Ag, and Au are easy to reduce means that the metals are easy to oxidize. 
E)  The coinage metals are Cu, Ag, and Au.

Question 12

Transition group elements differ from main group metals in several ways. Which differences of the following are correct?

Accepted Answer

A)  many of the metals and their compounds having catalytic activity 
B)  many of the hydrated cations having distinctive colors 
C)  most of their compounds having bonds that involve d orbitals 
D)  many of the metals being paramagnetic, but none ferromagnetic 
E)  most having more than one common oxidation state 
A)  many of the metals and their compounds having catalytic activity 
B)  many of the hydrated cations having distinctive colors 
C)  most of their compounds having bonds that involve d orbitals 
D)  many of the metals being paramagnetic, but none ferromagnetic 
E)  most having more than one common oxidation state

Question 13

Choose the INCORRECT statement.

Accepted Answer

A)  Cu, Ag, and Au do not react with oxygen in the air. 
B)  Cu will corrode in moist air. 
C)  Ag will react with sulfur in the air to form tarnish. 
D)  Copper is used as copper halide in photography. 
E)  Copper is essential to life in trace amounts. 
A)  Cu, Ag, and Au do not react with oxygen in the air. 
B)  Cu will corrode in moist air. 
C)  Ag will react with sulfur in the air to form tarnish. 
D)  Copper is used as copper halide in photography. 
E)  Copper is essential to life in trace amounts.

Question 14

Which element displays ferromagnetism?

Accepted Answer

A)  Co 
B)  Cu 
C)  Ti 
D)  Cr 
E)  V 
A)  Co 
B)  Cu 
C)  Ti 
D)  Cr 
E)  V

Question 15

MnO4- produces what manganese-containing species when used as an oxidizing agent in weakly basic solution?

Accepted Answer

A)  MnO42- 
B)  Mn 
C)  Mn2+ 
D)  Mn2O3 
E)  MnO2 
A)  MnO42- 
B)  Mn 
C)  Mn2+ 
D)  Mn2O3 
E)  MnO2

Question 16

Choose the INCORRECT completion of the following sentence: "The transition elements are characterized by....

Accepted Answer

A)  ...their ability to exist in several different oxidation states." 
B)  ...poor electrical conductivity." 
C)  ...moderate to extreme hardness." 
D)  ...the formation of mostly colored compounds." 
E)  ...high melting points." 
A)  ...their ability to exist in several different oxidation states." 
B)  ...poor electrical conductivity." 
C)  ...moderate to extreme hardness." 
D)  ...the formation of mostly colored compounds." 
E)  ...high melting points."

Question 17

At 273 K, ΔG° for the reaction 2 C + O2 → 2 CO
Is about -280 kJ, and at 1480 K is about -580 kJ. For the reaction
2 Zn + O2 → 2 ZnO
ΔG° at 273 and 1480 K, respectively, is -640 and -280 kJ. Calculate ΔG° at 273 and 1480 K, respectively, for the reduction of zinc oxide by carbon.

Accepted Answer

A)  +180 and -150 kJ 
B)  +360 and -300 kJ 
C)  -360 and +300 kJ 
D)  -180 and +150 kJ 
A)  +180 and -150 kJ 
B)  +360 and -300 kJ 
C)  -360 and +300 kJ 
D)  -180 and +150 kJ

Question 18

Choose the INCORRECT statement.

Accepted Answer

A)  Iron's main uses is in steel. 
B)  The ferromagnetic metals are Fe, Co, Ni. 
C)  Iron only exists in +1 and +2 oxidation states. 
D)  Fe, Co, and Ni can all exist in the +2 oxidation state. 
E)  Fe(H2O)62+ is more stable than Fe(H2O)63+ because it has a half-filled d subshell. 
A)  Iron's main uses is in steel. 
B)  The ferromagnetic metals are Fe, Co, Ni. 
C)  Iron only exists in +1 and +2 oxidation states. 
D)  Fe, Co, and Ni can all exist in the +2 oxidation state. 
E)  Fe(H2O)62+ is more stable than Fe(H2O)63+ because it has a half-filled d subshell.

Question 19

Choose the INCORRECT statement about metallurgy.

Accepted Answer

A)  Zone refining is refining to a certain zone of purity. 
B)  Refining is the removal of impurities from a metal. 
C)  The Kroll process uses Mg to reduce TiCl4 to titanium. 
D)  Zone refining uses a heating coil which passes along the rod of material. 
E)  In zone refining impurities remain in the molten area. 
A)  Zone refining is refining to a certain zone of purity. 
B)  Refining is the removal of impurities from a metal. 
C)  The Kroll process uses Mg to reduce TiCl4 to titanium. 
D)  Zone refining uses a heating coil which passes along the rod of material. 
E)  In zone refining impurities remain in the molten area.

Question 20

Gold does not react with either nitric acid nor hydrochloric acid alone, but can be dissolved by aqua regia to form the tetrachloroaurate(III) ion, water and nitric oxide. What is the sum of the coefficients when the net equation for this process is balanced?

Accepted Answer

A)  17 
B)  14 
C)  11 
D)  9 
E)  7 
A)  17 
B)  14 
C)  11 
D)  9 
E)  7

Exam 23: The Transition Elements

The lanthanide contraction is due to the poor shielding effect of the f-electrons and the higher nuclear charge.

The phenomenon resulting from the weakly effective screening of outermost electrons from the nucleus by f subshell electrons, resulting in only small differences in atomic radii in elements of atomic number 58-71, is called the:

A 25.0 mL aliquot of a solution containing Fe2+, prepared during an assay of a pyrite ore, was titrated to a faint purple endpoint by 32.2 mL of 0.020 M KMnO4. What was the molarity of the Fe2+ solution? [The permanganate was reduced to Mn2+.]

The coinage metals are copper, silver, and zinc.

What are the formulas of the missing compounds, 1 and 2, respectively, in the reaction below? This reaction is used in the production of metallic zinc. ZnO(s) + 1 → Zn(g) + 2

If a solution is prepared by dissolving 1.6 mol Na2CrO4 in 1.0 L of a buffer at pH 8.24, what will be [Cr2O72-] in the solution? The resultant equilibria are: HCrO4- ⇌ H+ + CrO42- Ka = 3.2 × 10-7 2 HCrO4- ⇌ Cr2O72-+ H2O K = 33

The atomic radius of Ru is approximately the same as that of Os.

Which of the following forms a colorless aqueous solution?

What volume of carbon monoxide, measured at 1200°C and 720 torr, would be released when 5.0 kg of an ore containing 45% zinc oxide as the only reacting species is treated with excess carbon? [ZnO + C → Zn + CO]

List the following in order of increasing density: Ti, Pd, Nb, Pt

Choose the INCORRECT statement.

Transition group elements differ from main group metals in several ways. Which differences of the following are correct?

Choose the INCORRECT statement.

Which element displays ferromagnetism?

MnO4- produces what manganese-containing species when used as an oxidizing agent in weakly basic solution?

Choose the INCORRECT completion of the following sentence: "The transition elements are characterized by....

At 273 K, ΔG° for the reaction 2 C + O2 → 2 CO Is about -280 kJ, and at 1480 K is about -580 kJ. For the reaction 2 Zn + O2 → 2 ZnO ΔG° at 273 and 1480 K, respectively, is -640 and -280 kJ. Calculate ΔG° at 273 and 1480 K, respectively, for the reduction of zinc oxide by carbon.

Choose the INCORRECT statement.

Choose the INCORRECT statement about metallurgy.

Gold does not react with either nitric acid nor hydrochloric acid alone, but can be dissolved by aqua regia to form the tetrachloroaurate(III) ion, water and nitric oxide. What is the sum of the coefficients when the net equation for this process is balanced?

Matter - Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Additional Aspects

Intermolecular Forces: Liquids and Solids

Solutions and Their Physical Properties

Chemical Kinetics

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Spontaneous Change: Entropy and Free Energy

Electrochemistry

Main Group Elements I: Groups 1, 2, 13, and 14

Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

Complex Ions and Coordination Compounds

Nuclear Chemistry 1-41

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

A 25.0 mL aliquot of a solution containing Fe²⁺, prepared during an assay of a pyrite ore, was titrated to a faint purple endpoint by 32.2 mL of 0.020 M KMnO₄. What was the molarity of the Fe²⁺ solution? [The permanganate was reduced to Mn²⁺.]

If a solution is prepared by dissolving 1.6 mol Na₂CrO₄ in 1.0 L of a buffer at pH 8.24, what will be [Cr₂O₇^2-] in the solution? The resultant equilibria are: HCrO₄^- ⇌ H⁺ + CrO₄^2- Ka = 3.2 × 10^-7 2 HCrO₄^-⇌ Cr₂O₇^2-+ H₂O K = 33

MnO₄^- produces what manganese-containing species when used as an oxidizing agent in weakly basic solution?

At 273 K, ΔG° for the reaction 2 C + O₂ → 2 CO Is about -280 kJ, and at 1480 K is about -580 kJ. For the reaction 2 Zn + O₂ → 2 ZnO ΔG° at 273 and 1480 K, respectively, is -640 and -280 kJ. Calculate ΔG° at 273 and 1480 K, respectively, for the reduction of zinc oxide by carbon.